Discriminant

One of the types of objects in Praat.

An object of type Discriminant represents the discriminant structure of a multivariate data set, i.e. a numberOfObservations×dimension matrix. Each row in this data set belongs to one of numberOfGroups groups (or classes or categories, whatever terminology you prefer). A Discriminant can be used as a classifier to discriminate between these numberOfGroups groups.

Inside a Discriminant

With Inspect, you will see that a Discriminant contains the following data:

eigen
the eigen structure, i.e. the eigenvalues and eigenvectors.
numberOfGroups
the number of groups between which we can discriminate.
groups
a list of dimension×dimension SSCP matrices, one for each group, numberOfGroups in total.
aprioriProbabilities
an array with numberOfGroups apriori probabilities of group membership

Commands

Creation:

• Discriminant analysis tutorial
• TableOfReal: To Discriminant

Drawing

• Draw eigenvalues...
• Draw eigenvector...
• Draw sigma ellipses...

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